120/200/300mm Adjustable Circle Hole Saw Cutter Drill Bit (300mm) Adjustable Circle Cutter, it can cut perfect circles effortlessly Graduated in metric sizes, just select the scale you want,locate the inner edges of the blade holders against the size graduation Can be used on plywood, laminates, composite boards, gypsum board, rubber and so on Notice: please dont use on steel sheet or other heavy metals Capacity: 30mm-120mm/ 30mm-200mm/ 30mm-300mm